Broaching-machine.



W. H. THIEMER.

BROAGHING MACHINE.

APPLIGATION FILED DEG. 9. 190s.

Patented 111511228, 1911.

W. H. THIEMER. BROAGHING MACHINE.

P 0 T O Patented Mar. 28, 1911.

2 SHEETS-SHEET 2.

5, is a vertical,

uNiTED sTATns PATENT ermee.

WILLIAM-H. THIEMER, OF CLEVELAND, OHIO, ASSIGNOR T0 THE WINTON 'MOTOR CARRIAGE COMPANY, OF CLEVELAND, 'OI-IIC.

BRoAcHINe-MACHINE.

Specification of Letters Patent.

Patented Mar. 28, 1911.

Application led December 9, 1908. Serial No. 466,689.

Cleveland, in the county of Cuyahoga andA State of Ohio, have invented certain new and useful Improvements in Broaching-Machines, of which the following is a specification, reference being had therein to the accompanying drawing. y

My invention relates to improvements in breaching machines, and the breaches used thereon The object of my invention is to lprovide a double-headed broaching machine whereby one broach is cutting on a piece of work during the movement to the right, and the broacli at the opposite end cutting on a second piece of work on the movement to the left.

Another object of my inventionnis to provide a broach which is composed of a series of separable independent parts, which can be replaced or removed when they become worn or broken.

A still further object of my invention is to rovide a more simple, cheap and effective broach having many details of structure hereinafter more fully pointed out.

In the accompanying drawings, Figure 1, is a side elevation of a table supporting my broach and showing the broach partly in section. Fig. 2, is an enlarged side elevation of my improved broach partly in section, and showing the chuck with the broach therein. Fig. 3, is a vertical, transverse, sectional view taken on the line 3-3 of Fig. 2. Fig. 4, is a vertical, transverse, sectional view taken on the line l--t of Fig. 2. Fig. transverse, sectional view 5-5`of Fig. 2. Fig. 6, is a sectional view of the taken on the line longitudinal, detailed, cutters and clearance disks of a modified form for cutting an angular hole in they gear wheel. Fig. 7, is a perspective view of a cutting ring and a clearance ring used in cutting anl angular opening in the wheel. Fig. 8, is a longitudinal sectional view of the chuck showing the jaws released so that the broach can be removed. Fi 9, is an enlarged, longitudinal, sectional view of an attachment whereby the broach can operate upon gears with openings of greater diameter than the broach. Fig. 10, is a transverse, sectional view taken on the line 8-8 ofFig. 9. Fig. 11, is a perspective v1ew of the cutter and clearance rings such as used in Fig. 2 of the drawings. Fig. 12 is a transverse sectional view showing the dovetail connection between the bed-plate 1 and the slidable supports 3 and 4.

Referring now to the drawings, 1 represents a table or bed plate having in its upper face 2 a dovet'aily groove in which are slidably mounted the supports 3 and f1 which are located about midway the ends from a central point, as clearly shown in Fig. 1. Extending longitudinally the bed-plate and parallel therewith is a threaded bar 5 which has its ends rigidly-mounted in the supports -3 and4, whereby the ba`r is prevented from rotating, yet allowed to move longitudinally and carry with it the supports 3 and 4.

Mounted in the bed-plate and extending. f

transverse thereof is a worm 6 carrying a pulley 7 driven by a belt 8 which is a cross and a straight belt, whereby the worm may be first driven in one direction and then the other, the purpose of which will be hereinafter more fully described.

-The bed-plate 1 has located therein midway its ends a plate 9 which is forked and adapted to straddle the worm 6. Between the arms of the plate 9 is a worm-gear 10 meshing with the worm 6, and said worm gear has an elongated hub portion 11 rotatably mounted in the arms of the plate 9 and rinternally threaded, and said threads mesh with the threads of the bar 5. In order to prevent friction between the arms and the wormgear I provide the sides of the wormgear with a ball-race in which are carried all bearin s '12 which bear against the inner face o the arms of the plate 9, and prevent longitudinal movement of the worm gear, yet allow it to freely revolve.

The ends of the bar 5 are provided with chucks 13 and 14.` which are adapted to receive and hold the breaches and which are so v constructed that they can be readily removed for inserting the work thereon, which I'willl nowproceed to describe.

The clutches consist of a sleeve-15 rigidly keyed or otherwise secured upon the'end of the bar 5, and having on opposite sides the slots 16 and 17, and tting within said sleeve 1s placed a collar 18 to which are pivoted at 19 and 20 the arms 21 and 22, and which extend out through the slots 16 and 17. The

said arms are constructed as shown and have hooked outer ends 23 adapted to catch over the arrow-head 24 of the breach, whereby the same is held therein. In order to lock the collar 18 in the sleeve l provide the cap 25, screwed into the sleeve. The outer face of the sleeve 15 is screw-threaded, and screwed thereon is the elongated member 26 having the smooth inner surface at its ends which are adapted to engage4 the beveled surfaces 27 and -28 of the arms 21 and 22, and rock the sameon their pivots. When the sleeve is screwed outwardly it engages the beveled surface 27 of the arms and forces the hooked ends 23 inwardly to engage the arrow-head of the broach and firmly lock the same. By moving the sleeve inwardly it engages the beveled surfaces 28 of the arms and moves the inner ends` inwardly, throwing the hooked ends outwardly and allowing the broach to be removed.

The ends of the bed plate l are provided with upwardly-extending portions 29 and 30 having ,openings 3l through which the broaches 32 and 33 pass, and said openings being of a size considerably larger than the broach lfor the pilrpose hereinafter more fully described. The outer faces of the portions 29 and 30 of the bed-plate are smooth and in a' perfect vertical alinement, and against these the gear or wheel being operated on is firmly held.

The broaches consist of the main body portion 34 of a size to snugly fit the. chuck and have the arrow-head 24 heretofore described. lhe said broach is provided with the elongated reduced cutter holding portion 35 and has its outer end screw-threaded and adapted to receive a nut 36 for clamping the cutters thereon. The said reduced portion 35 is provided with a feather 37 for locking the cutters thereon against rotation. The cutters consist of disks or rings 38 having central openings to receive the portion 35,

and also provided with the key seat 39 adapted to receive the feather 37 and prevent the saine from rotating. rlihe disks or rings are provided with cutting projections 40 which start on the inner` ring or disk 38 of a length of a few thousandths of an inch, and each succeeding disk has its projection slightly larger until the outer ringor disk 41 has a projection 42 of the length shown in Fig. 2. Between the rings or cuttersare the spacers 43 which are keyed upon the portion 35 the same way as the cutters and are of the same diameter. The outer periphery of the spacers at the upper end opposite the cutprojections are provided with transverse grooves 44 forming clearances in which the stock falls as it is cut and conveyed through the gear.

Any desired number of cutters can be used on the broach, and as will be seen, the breach does not cut upon the outward or pushing movement thereof, but cuts on the pulling keyed by the key esalta proie@- toward chuck 13, and the machine is started so as-v to move the bar 5 to the right. The gear 45 is drawn against the portion 29 and rmly held while the first cutter 438 is acting or cutting the key-Way in the hub thereof. Before the cutter 38 has passed from the hub thel next cutter enters the hub and starts cutting or increasing the depth of the keyway, and .thus it will be seen that the gear is prevented from rotating. When the bar 5 has reached its extreme movement to the right, the broach 33 is removed and a gear placed thereon, and the movement of the bar 5 to the left causes the broach to hold the gear against the portion 30 and cut a keyway therein, and thus the machine is cutting on both movements to the right and left.

When it is desired to cut an angular opening in the gear, l provide acutter as indi.- `cated at 46, F ig. 7, which has the cutting edges 47 at the corners, and when such cutters are used a clearance disk 48 is used having the groove 49 entirely surrounding the outer periphery thereof. `While l have here shown this form of cutter, it will be understood that any desired form can be used.

In cutting gears of different sizes and. necessarily having openings ofditferent diameters, l provide an eccentric block 50 which has an enlarged shank vportion 5l 52 in the opening of the member 29. The outer end 53 is provided with an eccentric 53 is made of different sizes to tit the different size openings in the gears, and the opening 54 communicating with the outer periphery at the upper face, it will be seen that the cutters of the broach will extend therethrough and will be brought in engagement with the gear for cutting the key-way, thus using the same broach in gears' of different sizes with openings of dierent sizes.

While I have shown and described this specific form of broach it will be understood that l do not claim the same as this forms a part of a divisional application.

Having thus described my invention, what l claim and desire to secure by Letters Patent, is

l. A broaching machine comprising a support, a-threaded bar carried by the support, and held against rotation, a broach removably carried by each end ofthe bar, a member in threaded engagement with the bar,

and means for rotating said member whereby the bar is moved longitudinally.

2. A breaching machine comprising a supopening 54. llthe member port, a threaded bar carried by the support and held against rotation, a broach carried by each end of the bar, a member in threaded engagement with the bar, and means for rotating said member, whereby the bar is moved longitudinally.

3. A broaching machine comprising a support, a threaded bar carried by the support and held against rotation, a broach removably secured to each end ot the bar, a wormgear having threaded connections with the 4 bar, a worm meshing with the worm-gear,

and means whereby the worm may be driven in either direction, whereby the bar is moved back and forth.

4. A broaching machine comprising a sup port, a double headed broach, a work Support adjacent each endL of the broach, and means intermediate the heads of the broach for moving the same, whereby the separate work is operated upon during the movement to the right and to the left.

5. A broaching mechanism comprising a double headed broach, means intermediate the heads of the broach for moving the same to the right and left, whereby the same can operateonseparate work during the pulling movement thereof.

6. A broaching machine comprising a support, a horizontally movable barcarried thereby and held against rotation, means for moving the bar longitudinally upon the support, a chuck carried by each end of the bar, and broaches carried by the chuck and. adapted to operate on separate work during the movement to the right and left.

7 A broaching machine comprising a support, a horizontally-movable bar carried by the support and held against rotation, means for' moving the Vloar longitudinally upon the support, a chuck carried by both ends of the bar, broaches carried by the chucks, and projections carried by the support at each end and against which the work` being operated on bears whereby the broaches are adapted to operate on separate vtfirk during the movement to the right and 8. A broaching machine comprising a support, a horizontally movable threaded bar 'c arried by the support and held against rotation, a worm-gear threaded on said bar, a worm meshing with said worm-gear, means for rotating said` worm in either direction, a broach` removably carried by each end of the bar, and stops carried by the support against which the work is held by the drawing movement of the broaches. J

9. A broaching machine comprising a support, bar carried by the support, and held against rotation, a worm-gear screwed on the ba'r, a worm extending transverse the support and meshing with the worm-gear, means whereby the worm may be rotated in either direca horizontally-movable threaded` tion, and a removable broach carried by each end of said bar.

10. A broaching machine comprising a horizontal bed-plate having a groove in its upper face, guide plates mounted in the groove, a horizontal bar between and mounted in said guides and held against rotation, means for moving the bar longitudinally, broaches carried by the bar on the outside of the guide plates, and work-supporting brackets carried by the outer ends ot the bed-plate and against the outer face of' which the work may be held by the drawingaction of the broaches. v

11. A broachi'ng machine comprising a horizontal bed-plate, a bar horizontally movable thereon andheld against rotation, means Jfor moving the b ar longitudinally, brackets carried by the ends of the bedplate, broaches carried by the ends of the bar and passing through enlarged openings in the brackets, an eccentric block within the openings in the brackets and through whichthe broaches pass, substantially as described.

12. A broaching machine c omprising a horizontal bed-plate, a bar horizontally movable thereon and held against rotation, means for moving the bar longitudinally, brackets carried by the ends of the bedplate, and having through, blocks within said openings and having an eccentric extension adapted to support the gear being operated on, and broaches rigidly carried by -the bar and passing through the blocks in the brackets.

13. A broaching machine comprising a bed-plate, having acentral depression, a bifurcated plate rigidly'secured in sai depression, a worm-gear having elongated hubs journaled in the arms of the bifurcated plate, a roller bearing between the edges of the arms and the sides of the worm gear, a worm meshing with the gear, means for rotating the worm in either direction, a threaded bar passing through the gear and having threaded connection therewith, the bed-plate having dovetail grooves therein, blocks slidable in the grooves and in which the bar is rigidly secured, and broaches removably carried by the ends of the bars on the outside of the blocks.

14. A broaching machine comprising a support, a horizontally movable bar, a broach carried b each end ot the bar, means for moving sai work support at each end of the support and through which the broaches work an against which the work is supported by the inward movement'of the broach.

15. A broaching machine comprising la support, a horizontally movable bai', a broach carried by each end of thebar, means for moving said bar, a work support carried by each end of the support and against horizontal openings therebar longitudinally, and a y all:

which the Work lis held by guide carried by the barl adjacent each broach and slidable on the support.

16. A broaohing machine comprising a support, a horizontally movable bar, means at the center of the bar for moving it longitudinally7 a chuck carried by' of said bar, a broach removably secured in each chuck, a Work support carried by each end of the support a-nd through Which the broaches pass and the Work adapted to bear against the outer face and held 1n said position by the inward movement of the broaoh, and guides carried by the bar intermediate the operating means and chucks slidably on the support.

17. A broaching machine comprising a bed-plate, having a central depression, a plate secured in said depression, a screwthe outer endsainst rotation, a

Worm gear journaled 1n the plate and /threaded on the bar, a Worm meshing With said gear, means for rotating the Worm in either direction, the bed-plate havin longitudinal grooves therein, blocks sli able in the grooves and rigidly carried by the outer end of said bar, chucks carried-by the outer ends of the bar, broaches removably secured in the chucks, and Work supporting brackets carried by' the bed plates on opposite sides of the brakes.

In testimony whereof I alix in presence of two Witnesses.

l WILLIAM H. THIEMER. Witnesses:

l lW. J. WARD,

ERLA LICHTENBERGER.

my signature the broaoh, a threaded bar longitudinally movable in 2 

